/**
 * Copyright (C) 2002-2015   The FreeCol Team
 * <p>
 * This file is part of FreeCol.
 * <p>
 * FreeCol is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * <p>
 * FreeCol is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with FreeCol.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.sf.freecol.server.model;

import java.util.logging.Logger;

import net.sf.freecol.common.model.Settlement;
import net.sf.freecol.common.model.Unit;
import net.sf.freecol.server.control.ChangeSet;


/**
 * A type of session to handle trading.
 */
public class TradeSession extends TransactionSession
{

    private static final Logger logger = Logger.getLogger( TradeSession.class.getName( ) );

    /** The moves the trading unit has left at start of session. */
    private final int movesLeft;

    /** Whether any action has been taken in this session. */
    private boolean actionTaken;

    /** Whether buying is still valid in this session. */
    private boolean canBuy;

    /** Whether selling is still valid in this session. */
    private boolean canSell;

    /** Whether giving a gift is still valid in this session. */
    private boolean canGift;


    /**
     * Creates a new <code>TradeSession</code>.
     *
     * @param unit The <code>Unit</code> that is trading.
     * @param settlement The <code>Settlement</code> to trade with.
     */
    public TradeSession( Unit unit, Settlement settlement )
    {
        super( makeSessionKey( TradeSession.class, unit, settlement ) );
        movesLeft = unit.getMovesLeft( );
        actionTaken = false;
        boolean atWar = settlement.getOwner( ).atWarWith( unit.getOwner( ) );
        canBuy = ! atWar;
        canSell = ! atWar && unit.hasGoodsCargo( );
        canGift = unit.hasGoodsCargo( );
    }

    @Override
    public void complete( ChangeSet cs )
    {
        super.complete( cs );
    }

    public int getMovesLeft( )
    {
        return movesLeft;
    }

    public boolean getActionTaken( )
    {
        return actionTaken;
    }

    public boolean getBuy( )
    {
        return canBuy;
    }

    public boolean getSell( )
    {
        return canSell;
    }

    public boolean getGift( )
    {
        return canGift;
    }

    public void setBuy( )
    {
        actionTaken = true;
        canBuy = false;
    }

    public void setSell( )
    {
        actionTaken = true;
        canSell = false;
    }

    public void setGift( )
    {
        actionTaken = true;
        canGift = false;
    }
}
